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The purpose of "stress" screening such as environmental stress screening (ESS) or highly accelerated stress screening (HASS) is to precipitate failures in weak or defective populations using some load (stress) condition(s) without reducing the required useful life of the product
ESS and HASS: Concerns with the Practices and Standards
ESS and HASS: Concerns with the Practices and Standards
Hilaire (Ananda) Perera P.Eng.
The TSFA Lab performs standard and custom tests and failure analysis services, including proprietary services that may range from a day to service year.
CALCE Test Services and Failure Analysis (TSFA) Laboratory
CALCE Test Services and Failure Analysis (TSFA) Laboratory
Hilaire (Ananda) Perera P.Eng.
Software reliability engineering has existed for over 50 years, fundamental prerequisite for virtually all modern systems. Diverse set of stakeholders requires pragmatic guidance and tools to apply software reliability models to assess real software or firmware projects during each stage of the software development lifecycle. Reliability engineers may lack software development experience. Software engineers may be unfamiliar with methods to predict software reliability. Both may have challenges acquiring data needed for the analyses. Newly revised IEEE 1633 Recommended Practice for Software Reliability provides actionable step by step procedures for employing software reliability models and analyses.
IEEE 1633 Recommended Practice on Software Reliability
IEEE 1633 Recommended Practice on Software Reliability
Hilaire (Ananda) Perera P.Eng.
Biomass refers to a group of organic materials that can be used to generate electric and thermal power. Sources of biomass are: herbaceous and woody plants, agriculture and forestry wastes and residues, landfill gases, animal wastes, municipal wastes, and other organic material.
BIOMASS Based Power ( Electrical & Thermal )
BIOMASS Based Power ( Electrical & Thermal )
Hilaire (Ananda) Perera P.Eng.
RGT is a planned test-analyze-and-fix (TAAF) process in which End Unit is tested under actual, simulated, or accelerated environments to disclose design deficiencies and defects. It is intended to provide a basis for early incorporation of corrective actions and for verification of their effectiveness, thus promoting reliability growth. RGT is intended to correct failures that reduce operational effectiveness and failures that increase maintenance and logistics support costs.
Reliability Growth Testing (RGT) Plan
Reliability Growth Testing (RGT) Plan
Hilaire (Ananda) Perera P.Eng.
The statistical Confidence Level (C.L.) is the probability that the corresponding confidence interval covers the true ( but unknown ) value of a population parameter. Such confidence interval is often used as a measure of uncertainty about estimates of population parameters
Statistical Confidence Level
Statistical Confidence Level
Hilaire (Ananda) Perera P.Eng.
A "m" out of "n" system is a system with "n" components which function if and only if "m" or more of the components function
Reliability if "m" of "n" Must be Working
Reliability if "m" of "n" Must be Working
Hilaire (Ananda) Perera P.Eng.
Environmental Stress Screening (ESS) is performed on most of the Electrical/Electronic products. However Failure Rate/Time distribution analysis is not conducted always to evaluate the effectiveness of the Screening Process
Outgoing Reliability Assurance of 'End-Units'
Outgoing Reliability Assurance of 'End-Units'
Hilaire (Ananda) Perera P.Eng.
Empfohlen
The purpose of "stress" screening such as environmental stress screening (ESS) or highly accelerated stress screening (HASS) is to precipitate failures in weak or defective populations using some load (stress) condition(s) without reducing the required useful life of the product
ESS and HASS: Concerns with the Practices and Standards
ESS and HASS: Concerns with the Practices and Standards
Hilaire (Ananda) Perera P.Eng.
The TSFA Lab performs standard and custom tests and failure analysis services, including proprietary services that may range from a day to service year.
CALCE Test Services and Failure Analysis (TSFA) Laboratory
CALCE Test Services and Failure Analysis (TSFA) Laboratory
Hilaire (Ananda) Perera P.Eng.
Software reliability engineering has existed for over 50 years, fundamental prerequisite for virtually all modern systems. Diverse set of stakeholders requires pragmatic guidance and tools to apply software reliability models to assess real software or firmware projects during each stage of the software development lifecycle. Reliability engineers may lack software development experience. Software engineers may be unfamiliar with methods to predict software reliability. Both may have challenges acquiring data needed for the analyses. Newly revised IEEE 1633 Recommended Practice for Software Reliability provides actionable step by step procedures for employing software reliability models and analyses.
IEEE 1633 Recommended Practice on Software Reliability
IEEE 1633 Recommended Practice on Software Reliability
Hilaire (Ananda) Perera P.Eng.
Biomass refers to a group of organic materials that can be used to generate electric and thermal power. Sources of biomass are: herbaceous and woody plants, agriculture and forestry wastes and residues, landfill gases, animal wastes, municipal wastes, and other organic material.
BIOMASS Based Power ( Electrical & Thermal )
BIOMASS Based Power ( Electrical & Thermal )
Hilaire (Ananda) Perera P.Eng.
RGT is a planned test-analyze-and-fix (TAAF) process in which End Unit is tested under actual, simulated, or accelerated environments to disclose design deficiencies and defects. It is intended to provide a basis for early incorporation of corrective actions and for verification of their effectiveness, thus promoting reliability growth. RGT is intended to correct failures that reduce operational effectiveness and failures that increase maintenance and logistics support costs.
Reliability Growth Testing (RGT) Plan
Reliability Growth Testing (RGT) Plan
Hilaire (Ananda) Perera P.Eng.
The statistical Confidence Level (C.L.) is the probability that the corresponding confidence interval covers the true ( but unknown ) value of a population parameter. Such confidence interval is often used as a measure of uncertainty about estimates of population parameters
Statistical Confidence Level
Statistical Confidence Level
Hilaire (Ananda) Perera P.Eng.
A "m" out of "n" system is a system with "n" components which function if and only if "m" or more of the components function
Reliability if "m" of "n" Must be Working
Reliability if "m" of "n" Must be Working
Hilaire (Ananda) Perera P.Eng.
Environmental Stress Screening (ESS) is performed on most of the Electrical/Electronic products. However Failure Rate/Time distribution analysis is not conducted always to evaluate the effectiveness of the Screening Process
Outgoing Reliability Assurance of 'End-Units'
Outgoing Reliability Assurance of 'End-Units'
Hilaire (Ananda) Perera P.Eng.
Transients can cause slow degradation, erratic operation, or catastrophic failure in electrical parts, insulation dielectrics, and electrical contacts used in switches and relays. The possible occurrence of transients must be considered in the overall electronic design. Required circuit performance and reliability must be assured both during and after the transient
Transient Suppressors
Transient Suppressors
Hilaire (Ananda) Perera P.Eng.
This document presents methodology to be used to predict mechanical component reliability using the Stress/Strength Interference Method. This method assumes that the material properties are time independent because of their slow change, and the components are not subjected to wear related failure modes
Reliability Prediction Procedure for Mechanical Components
Reliability Prediction Procedure for Mechanical Components
Hilaire (Ananda) Perera P.Eng.
Software Reliability models have been in existence since the early 1970, over 200 have been developed. Some of the older models have been discarded based upon more recent information about the assumptions, and newer ones have replaced them.
Software Reliability
Software Reliability
Hilaire (Ananda) Perera P.Eng.
Virtual qualification is the first stage of the overall qualification process. It is the application of Physics of Failure (PoF) based reliability assessment to determine if a proposed product can survive its anticipated life cycle
Virtual Qualification
Virtual Qualification
Hilaire (Ananda) Perera P.Eng.
Availability is a performance criterion for repairable systems that accounts for both the reliability and maintainability properties of a component or system. It is defined as the probability that the system is operating properly when it is requested for use
Availability
Availability
Hilaire (Ananda) Perera P.Eng.
Testability refers to the design parameter which makes it relatively easy to identify and isolate faults in the system. Testability can be considered to be a subset of maintainability, because fault detection and isolation are important drivers in the maintainability of a system
Testability
Testability
Hilaire (Ananda) Perera P.Eng.
This handbook is written to show how greater control can be gained over total product reliability by the utilization of Accelerated Stress Testing techniques (AST)
Accelerated Stress Testing
Accelerated Stress Testing
Hilaire (Ananda) Perera P.Eng.
This standard defines methods for calculating the early life failure rate of a product, using accelerated testing, whose failure rate is constant or decreasing over time. For technologies where there is adequate field failure data, alternative methods may be used to establish the early life failure rate. The purpose of this standard is to define a procedure for performing measurement and calculation of early life failure rates. Projections can be used to compare reliability performance with objectives, provide line feedback, support service cost estimates, and set product test and screen strategies to ensure that the Early life Failure Rate meets customers' requirements.
Early Life Failure Rate Calculation Procedure for Semiconductor Components
Early Life Failure Rate Calculation Procedure for Semiconductor Components
Hilaire (Ananda) Perera P.Eng.
Use of Failure Mechanisms enhance FMEA and FMECA
Use of Failure Mechanisms enhance FMEA and FMECA
Hilaire (Ananda) Perera P.Eng.
Basic Design Considerations for Surface Mount Technology
Basic Design Considerations for Surface Mount Technology
Hilaire (Ananda) Perera P.Eng.
Thermal cycling screen development
Thermal cycling screen development
Hilaire (Ananda) Perera P.Eng.
Design For Reliability
Design For Reliability
Hilaire (Ananda) Perera P.Eng.
Rating & uprating handbook
Rating & uprating handbook
Hilaire (Ananda) Perera P.Eng.
Junction Temperature in a Pulse Power Application
Junction Temperature in a Pulse Power Application
Hilaire (Ananda) Perera P.Eng.
Vibration before thermal cycling in ESS
Vibration before thermal cycling in ESS
Hilaire (Ananda) Perera P.Eng.
Mechanical component reliability
Mechanical component reliability
Hilaire (Ananda) Perera P.Eng.
Maintainability engineering
Maintainability engineering
Hilaire (Ananda) Perera P.Eng.
Highly accelerated stress screening
Highly accelerated stress screening
Hilaire (Ananda) Perera P.Eng.
Prognostic health management
Prognostic health management
Hilaire (Ananda) Perera P.Eng.
Cost effectiveness for maintainable products
Cost effectiveness for maintainable products
Hilaire (Ananda) Perera P.Eng.
This presentation is from the Paper 207: Contemporary Literature in English, Unit 1: Amitav Ghosh’s Gun Island (2019) and I choose the topic Exploring Existential Depths: Susan Macleod's Journey and the Philosophical Realm.
Exploring_the_Narrative_Style_of_Amitav_Ghoshs_Gun_Island.pptx
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Transients can cause slow degradation, erratic operation, or catastrophic failure in electrical parts, insulation dielectrics, and electrical contacts used in switches and relays. The possible occurrence of transients must be considered in the overall electronic design. Required circuit performance and reliability must be assured both during and after the transient
Transient Suppressors
Transient Suppressors
Hilaire (Ananda) Perera P.Eng.
This document presents methodology to be used to predict mechanical component reliability using the Stress/Strength Interference Method. This method assumes that the material properties are time independent because of their slow change, and the components are not subjected to wear related failure modes
Reliability Prediction Procedure for Mechanical Components
Reliability Prediction Procedure for Mechanical Components
Hilaire (Ananda) Perera P.Eng.
Software Reliability models have been in existence since the early 1970, over 200 have been developed. Some of the older models have been discarded based upon more recent information about the assumptions, and newer ones have replaced them.
Software Reliability
Software Reliability
Hilaire (Ananda) Perera P.Eng.
Virtual qualification is the first stage of the overall qualification process. It is the application of Physics of Failure (PoF) based reliability assessment to determine if a proposed product can survive its anticipated life cycle
Virtual Qualification
Virtual Qualification
Hilaire (Ananda) Perera P.Eng.
Availability is a performance criterion for repairable systems that accounts for both the reliability and maintainability properties of a component or system. It is defined as the probability that the system is operating properly when it is requested for use
Availability
Availability
Hilaire (Ananda) Perera P.Eng.
Testability refers to the design parameter which makes it relatively easy to identify and isolate faults in the system. Testability can be considered to be a subset of maintainability, because fault detection and isolation are important drivers in the maintainability of a system
Testability
Testability
Hilaire (Ananda) Perera P.Eng.
This handbook is written to show how greater control can be gained over total product reliability by the utilization of Accelerated Stress Testing techniques (AST)
Accelerated Stress Testing
Accelerated Stress Testing
Hilaire (Ananda) Perera P.Eng.
This standard defines methods for calculating the early life failure rate of a product, using accelerated testing, whose failure rate is constant or decreasing over time. For technologies where there is adequate field failure data, alternative methods may be used to establish the early life failure rate. The purpose of this standard is to define a procedure for performing measurement and calculation of early life failure rates. Projections can be used to compare reliability performance with objectives, provide line feedback, support service cost estimates, and set product test and screen strategies to ensure that the Early life Failure Rate meets customers' requirements.
Early Life Failure Rate Calculation Procedure for Semiconductor Components
Early Life Failure Rate Calculation Procedure for Semiconductor Components
Hilaire (Ananda) Perera P.Eng.
Use of Failure Mechanisms enhance FMEA and FMECA
Use of Failure Mechanisms enhance FMEA and FMECA
Hilaire (Ananda) Perera P.Eng.
Basic Design Considerations for Surface Mount Technology
Basic Design Considerations for Surface Mount Technology
Hilaire (Ananda) Perera P.Eng.
Thermal cycling screen development
Thermal cycling screen development
Hilaire (Ananda) Perera P.Eng.
Design For Reliability
Design For Reliability
Hilaire (Ananda) Perera P.Eng.
Rating & uprating handbook
Rating & uprating handbook
Hilaire (Ananda) Perera P.Eng.
Junction Temperature in a Pulse Power Application
Junction Temperature in a Pulse Power Application
Hilaire (Ananda) Perera P.Eng.
Vibration before thermal cycling in ESS
Vibration before thermal cycling in ESS
Hilaire (Ananda) Perera P.Eng.
Mechanical component reliability
Mechanical component reliability
Hilaire (Ananda) Perera P.Eng.
Maintainability engineering
Maintainability engineering
Hilaire (Ananda) Perera P.Eng.
Highly accelerated stress screening
Highly accelerated stress screening
Hilaire (Ananda) Perera P.Eng.
Prognostic health management
Prognostic health management
Hilaire (Ananda) Perera P.Eng.
Cost effectiveness for maintainable products
Cost effectiveness for maintainable products
Hilaire (Ananda) Perera P.Eng.
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Transient Suppressors
Transient Suppressors
Reliability Prediction Procedure for Mechanical Components
Reliability Prediction Procedure for Mechanical Components
Software Reliability
Software Reliability
Virtual Qualification
Virtual Qualification
Availability
Availability
Testability
Testability
Accelerated Stress Testing
Accelerated Stress Testing
Early Life Failure Rate Calculation Procedure for Semiconductor Components
Early Life Failure Rate Calculation Procedure for Semiconductor Components
Use of Failure Mechanisms enhance FMEA and FMECA
Use of Failure Mechanisms enhance FMEA and FMECA
Basic Design Considerations for Surface Mount Technology
Basic Design Considerations for Surface Mount Technology
Thermal cycling screen development
Thermal cycling screen development
Design For Reliability
Design For Reliability
Rating & uprating handbook
Rating & uprating handbook
Junction Temperature in a Pulse Power Application
Junction Temperature in a Pulse Power Application
Vibration before thermal cycling in ESS
Vibration before thermal cycling in ESS
Mechanical component reliability
Mechanical component reliability
Maintainability engineering
Maintainability engineering
Highly accelerated stress screening
Highly accelerated stress screening
Prognostic health management
Prognostic health management
Cost effectiveness for maintainable products
Cost effectiveness for maintainable products
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